Troughton & Simms Theodolite

Description
This 30-inch theodolite was made by Troughton & Simms in London for the U. S. Coast Survey, probably in the late 1840s. Only the unusually short trunnions, telescope, small vertical circle, and micrometer eyepiece remain. The standards, graduated horizontal circle, and tripod base are missing.
Ref: C. A. Schott, "Determination of the Astronomical Azimuth of a Direction," United States Coast Survey Annual Report (1866), Appendix No. 11.
Location
Currently not on view
date made
late 1840s
maker
Troughton and Simms
place made
United Kingdom: England, London
Measurements
telescope aperture: 2 3/8 in; 6.0325 cm
telescope: 30 in; 76.2 cm
vertical circle: 5 1/2 in; 13.97 cm
trunions: 12 1/2 in; 31.75 cm
ID Number
PH.316510
accession number
225703
catalog number
316510
Credit Line
U.S. Coast and Geodetic Survey
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

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